Combination-lock.



No. 717,889. I PATBNTED JAN. 6, 1903,

' J. B. MILLER.

' COMBINATION LOCK.

APPLIOA'IION FILED NOV. 19, 1901. 1'0 MODEL.

m i 3; i .f 2 *1 Fly. 2.. Fig 1 Witnesses. V Inventor.

STATES JAMES B. MILLER, OFVKENT, OHIO.

COMBINATION-LOCK.

sPEoIFIcA'rIon forming part of Letters Patent No. 717,889, dated January 6, 1903.

. Application filed Novemberll), 1901. Serial No. 82,831. (No model.

To all whom, it may concern:

Be it known that I, JAMESB. MILLER, a citizen of the United States, residing at Kent, in the county of Portage and State of Ohio, have invented a new and useful Improvement in Combination-Locks, of Which the following is a specification. 1

My invention relates to improvements in combination-locks of the type shown and described in United States Patent to Miller, February 10, 1891, No. 446,071.

It has been found that in many places the operating-knob permanently attached tothe lock is objectionable. In places where a great many people have access to them, as on coinand-slot machines, parts of the locks are worn out by the frequent attempts tounlock them. To overcome this objection and to make the look more secure or efficient are the objects of my invention. I attain these objects by the mechanism and construction illustrated in the accompanying drawings, in Which Figure 1 is a side elevation of the lock with the cover removed, and Fig. 2 a vertical sectional elevation on the line 1 1 of Fig. 1 through the lock and the door to which it is attached.

The various parts necessary to a lock of this type-via, a cam-bearing disk at, a boltlocking device b, a bolt 0, a friction-spring d, and a bolt-shifter eare arranged in the usual way within a casingf, having a removable cover h.

The reference-letter 6 refers to a portion of a door or drawer to which the lock is attached, andj is an escutcheon-plate.

The combination-disk a is the well-known Douds disk, patented to Douds January 15, 1889, No. 396,273, and this disk, together with the bolt,bolt-locking device,indicating-spring d, and the means for connecting the boltshifter to the'bolt, are all the same as in the patent to Miller, hereinbefore mentioned.

One end of the locking-device b is pivoted to the casing, and its free end overlaps the disk a and bolt cand is provided with a stud for engaging with the bolt to lock it and for engaging with the cams on the side of the cam-disk, by which it is moved either toward or from the center of the disk. A continuous movement of the disk in one predetermined direction moves the locking-stud toward the center of the disk until it engages with a stop (not shown) projecting from the disk or from its hub and stops the disk. From this deadstop as a zero-point a series of rotary movements of the disk in opposite directions, predetermined as to number and extent by the number, shapes, and relative locations of the cams, moves the locking-stud to the outer edge of the disk and out of locking engagement with the bolt." There are notches at regular intervals in the periphery of the disk which by increasing the frictional resistance after the contact point'of the indicatingspring drops into them indicate to the operator the completion of fractional parts and also the completion of the whole of each movement in the series.

One end of the cylindrical part of the boltshifter c has a free bearing in the hub is of the cam-disk a, and the other extends through and has a bearing in the cover h. The slotted arm part of the bolt-shifter e is connected to the bolt 0 by a pin Z in the usual Way.

For operating the cam-disk and bolt-shifter instead of the permanently-attached knob and spindle I provide a removable key m. A short portion at of the stem of the key m is preferably made square in cross-section, the main portion thereof being cylindrical, its diameter about equal to one side of the square portion 12. The corners of the square portion are thus lateral projections from the main key-shaft. The cam-disk has a square hole at its center to receive the square part of the key. There is a passage-way for the key longitudinally through the cylindrical part of the bolt-shifter e, the said passageway being round throngh the end portions and square through the central portion of the said cylindrical part and just large enough to permit the square part of the key to pass through freely. Theround part of the passage-Way in the end next to the camdisk hub 75 is deep enough to allow the square end portion of the key to be entirely withdrawn from the disk before entering the square part of the passage-way in the boltshifter and forms a chamber within which the key end may turn freely without moving either the disk or the bolt-shifter. The round part of the passage-way in the outer end of the bolt-shifter is to guide the key into the square part of the passage-way.

The passage-way through the escutcheonplate may be either square or round and is large enough to letthe key pass freely.

With the square end portion of the key in the cam-disk hub, as shown, it may be operated to rotate the disk, and by withdrawing it into the square passage-Way of the boltshifter it may be operated to throw the bolt.

Shapes other than the square cross-section may be used for the end n of the key by forming the passage-way in the disk and in the bolt-shifter properly to correspond.

After locking the key is removed, as with the common key-lock.

What I claim as my invention, and desire to secure by Letters Patent, is

In a combination-lock, a rotary disk provided with a series of cam projections, and

an oscillating bolt-shifter arranged with its pivotal axis coinciding with the axis of the rotary disk, and having a passage-way through it, in combination with a key having an end adapted to pass through the said passageway and engage with the rotary disk to turn it and provided with one or more lateral projections for engaging with and operating the bolt-shifter; a portion of the said passageway shaped substautially as shown to adapt the bolt-shifter to be operated by engagement with the said lateral projections of the key, and a portion enlarged to permit the key end to turn within the passage-way, substantially as set forth. Y

JAMES B. MILLER.

Witnesses:

W. W. REED, O. A. SMITH. 

